Apparatus for drying paper, pasteboard, wood-pulp, and other materials.



L. A. LYCHE.

APPARATUS FOR DRYING PAPER, PASTEBOARD, WOOD PULP, AND OTHER MATERIALS.

APPLICATION FILED OCT. 12, 1911.

1 71,738}. Patented July 9, 1918.

are.

LEO ARNEMANN LYCHE, 0F SANDVIKEN, NEAR CHRISTIANIA, NORWAY.

APPARATUS FOR DRYING PAPER, PASTEIBOARD, WOOD-PULP, AN D OTHER MATERIALS.

Specification of Letters Patent.

Patented July 9, 391$.

Application filed October 12, 1917. Serial No. 196,324.

To all whom it may concern:

Be it known that I, LEO ARNEMANN Lrcnn, a subject of the King of Norway, residing at Sandviken, near Christiania, inthe Kingdom of Norway, have invented certain new and useful Improvements in Apparatus for Drying Paper, Pasteboard, Wood-Pulp, and other Materials; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

This invention has for its ob ect an apparatus for drying paper, pasteboard, wood pulp and other materials. The apparatus is of that type in which the material to be dried is passed in a zigzag direction through a drying chamber, where it is subjected to the action of air in motion.

According to the invention the drying is effected by means of hot air, which is brought to flow along the running web or layer of material to be dried in direct contact .with this latter in chambers situated one above the other, each of which having as its bottom the material itself carried on a felt or the like, the roof of the chamber being formed of a part of the conveyer while at the ends the chamber is closed by the web or layer of material on its passing from one of the conveyers to the other the sides of the chamber being formed of the side walls of the apparatus. Hot drying air is introduced at one end of each of the said cham-- bers and is drawn out at the other end in a quantity, and at a temperature which adjusted according to the degree of humldity of the paper at the point of the drying apparatus in question. An embodiment of the invention is diagrammatically illustrated in the accompanying drawing.

Figure 1 is a Vertical sectional view of the apparatus.

Fig. 2 is a top view of a detall.

In the example illustrated the conveyers are all formed of two felts 1 and 2, which run in such manner in relation to one another, that a zigzag channel is formed between the felts, through which the web is passed. Parallel to the edges of the felts are arranged vertical walls 12 (Fig. 2), which form the side walls of the chambers.

The felts 1 and 2 run over driving rolls 3 and e and guide rolls 5, 6 and 7. The paper web or other material to be dried is introduced at X and is carried by the felt 1 in the direction of the arrow until it reaches the roll 41, where it is taken up by the felt 2, which carries itin an opposite direction along to the roll' 3, where it runs down upon the underlying felt and farther on until it passes out at Y. Hot drying air is introduced through the pipes 8 and flows from this point in the same directionas the ma-' terial to be dried until it reaches the pipes 9 through which the humid air is drawn out.

The hanging middle parts of the felts act to press the air down on the paper web where its drying action is intensified.

In order to facilitate the passage of the material from one felt to the other suitable guide lists or scrapers 13 may be provided at the point where the felts leave one another.

Instead of introducing the material to be dried at X it may also be introduced at Y, the apparatus being then brought to run in the reverse direction. A series of apparatus of the described construction may be arranged, the material to be dried being then passed from one apparatusto the other alternately at the top and at the bottom. At the ends of the rolls (3 and 4:) belts 11 Fig. 2 may be arranged so as to run with one edge in contact with the side walls 12 of the apparatus. By this arrangement the arising of air currents upward or downward along the said walls are prevented.

As there may arise a current of hot air upward along the walls on both sides of the felts it may occur that the part of the paper web, which is situated near the edges of the felts is more strongly dried than the central part of the web. To avoid this there may be introduced humid air at the edges of the felts. The humid air necessary for this purpose is suitably taken from the air discharge of the chamber.

The current of air through each of the chambers is suitably so adjusted that it obtains the same velocity as that of the paper web and follows this latter with the result that the web is quite uniformly dried. As compared with the usual drying apparatus with revoluble drying cylinders the apparatus is very compact, simple and inexpensive in its construction as well as regards its working and in cases of repair. Further I so it is a matter of experience that a stronger product is obtained when the drawing is efiected by means of hot air, than when the usual drying machines with heated drums are employed. 'Also from this reason it will be of advantage to employ the described apparatus in connection with the paper engine instead of the drying drums. The apparatus may be employed for the purpose of drying paper an other materials in the form of continuous webs and in the form of sheets as well as other materials for instance in a pulverulent condition or the like.

I claim: I 1. An apparatus for drying material by means of hot air in which a layer of the material is passed along a zigzag path, comprising endless conveying belts, means to guide the belts so as to produce between different sections thereof separate chambers one above the other, means to hold the conveying belt sections against one another at the ends of each of the chambers, means to supply hot air to one end of each of the separate chambers, and means to withdraw the vapors produced from the other end of each of the chambers.

2. An apparatus for drying material by means of hot air in which a layer of the material is passed along a zigzag path, comprising endless conveying belts, means to guide the belts so as to produce between different sections thereof separate chambers one above the other, means to hold the conveying belt sections against one another at the ends of each of the chambers, means to supply hot air to the end of each of the separate chambers, and means to withdraw the vapors produced from the other end of each of the chambers, the means for supplying the air being arranged at that end of the chambers at which the material is introduced.

3. An apparatus for drying material by means of hot air in which a layer of the material is passed along a zigzag path, comprislng endless conveying belts, means to guide the belts so as to produce between difl'erent sections thereof separate chambers one above the other, means to hold the conveying belt sections against one another at the end of each of the chambers, means to supply hot air to one end of each of the said separate chambers, means to withdraw the vapors produced from the other end of each of the chambers and means for supplying illlfilld air at the edges of the conveying fl. An apparatus for drying material by means of 0t air in which a layer of the material is lpassed along a zigzag path, comprising en less conveying belts, means to guide the belts so as to produce between difierent sections thereof separate chambers one above the other, means to hold the con veying belt sections against one another at the ends of each of the chambers, means to supply hot air to one end of each of the said so arate chambers, and means to withdraw t e vapors produced from the other end of each of the chambers, the said conveying belts running on rollers, over the ends of wh1ch run narrow supporting belts whose outer edges slide.close up to the end walls of the drying chamber.

In testimony that I claim the foregoing as my invention, I have signed my name in presence of two subscribing witnesses.

LEO ARNEMANN LYCHE. Witnesses:

C. JORMZAN, C. FABmcrUs Hansen. 

